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Vliv vybraných faktorů na mléčnou užitkovost ovcí na bázi plemene lacaune
Konečná, Leona
The aim of this study was to determine and evaluate the chosen factors organic milk quality parameters and daily milk yield (DMY) in the flock of crossbreeds of Lacaune (LC) and East Friesian (EF) ewes from the first to fifth lactation. Experiment occurred during two lactation periods, in 2009 were included in experiment 90 ewes, and in 2010 88 ewes. Milk records and samplings were carried out five times during milking period during the months May (V), June (VI), July (VII), August (VIII) and September (IX). Milk samplings were carried out during the morning milking (6 a.m.). Individual milk samples were analyzed for: total solids (TS, in %), fat (F, in %), protein (P, in %), casein (C, in %), and lactose (L, in %). In addition the samples from chosen ewes (n = 48) were analyzed for: urea (U, in mg/100ml), pH, titratable acidity (TA, in degree SH), somatic cell count (SCC, in 103/ml), rennet clotting time (RCT, in s) and rennet curd quality (RCQ). In the study the effects of year (Y), lactation stage (LS), genotype (G), parity (PA), litter size (LIS) and age (A) of ewes on chosen parameters were evaluated, as well as their interactions with LS. Y had significant effect on all analyzed parameters except DMY. Y had significant effect on pH and SCC too. In 2009 the highest values of TS, F, P, C, L were found in comparison to 2010. In 2010 higher values U, pH, TA, SCC, RCT, RCQ were found in comparison to 2009. LS had significant effect on all analyzed parameters except SCC. The contents of TS, F, P, C and U increased in sheep milk toward the end of the lactation, the DMY logically decreased. At the end of lactation was found the highest value of lactose, the longest RCT and worse RCQ. G had significant effect on all analyzed basic components except P. The ewes of genotype LC 50 EF 50 had the highest DMY and the highest values of all analyzed basic components of milk. Significant effect of PA was observed on DMY, all basic components of milk and pH and TA. The highest DMY was achieved at the fourth lactation. The highest values of TS, F, P, C and L were found at the fourth lactation in all ewes and at the second lactation in the chosen group of ewes (n = 48). LIS had significant effect on all analyzed basic components except L in all ewes. In the Ewes giving birth to 2 lambs had higher DMY and the higher values of all basic components, SCC, the longest RCT and worse RCQ in comparison with ewes giving birth to 1 lamb. A had significant effect on all analyzed basic components and on pH and TA. The ewes in age 4 years had the highest DMY. The highest values of TS, F, P and C were found in age 6 years.
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Vliv vybraných faktorů na mléčnou užitkovost ovcí na bázi plemene lacaune
Konečná, Leona
The aim of this study was to determine and evaluate the chosen factors organic milk quality parameters and daily milk yield (DMY) in the flock of crossbreeds of Lacaune (LC) and East Friesian (EF) ewes from the first to fifth lactation. Experiment occurred during two lactation periods, in 2009 were included in experiment 90 ewes, and in 2010 88 ewes. Milk records and samplings were carried out five times during milking period during the months May (V), June (VI), July (VII), August (VIII) and September (IX). Milk samplings were carried out during the morning milking (6 a.m.). Individual milk samples were analyzed for: total solids (TS, in %), fat (F, in %), protein (P, in %), casein (C, in %), and lactose (L, in %). In addition the samples from chosen ewes (n = 48) were analyzed for: urea (U, in mg/100ml), pH, titratable acidity (TA, in degree SH), somatic cell count (SCC, in 103/ml), rennet clotting time (RCT, in s) and rennet curd quality (RCQ). In the study the effects of year (Y), lactation stage (LS), genotype (G), parity (PA), litter size (LIS) and age (A) of ewes on chosen parameters were evaluated, as well as their interactions with LS. Y had significant effect on all analyzed parameters except DMY. Y had significant effect on pH and SCC too. In 2009 the highest values of TS, F, P, C, L were found in comparison to 2010. In 2010 higher values U, pH, TA, SCC, RCT, RCQ were found in comparison to 2009. LS had significant effect on all analyzed parameters except SCC. The contents of TS, F, P, C and U increased in sheep milk toward the end of the lactation, the DMY logically decreased. At the end of lactation was found the highest value of lactose, the longest RCT and worse RCQ. G had significant effect on all analyzed basic components except P. The ewes of genotype LC 50 EF 50 had the highest DMY and the highest values of all analyzed basic components of milk. Significant effect of PA was observed on DMY, all basic components of milk and pH and TA. The highest DMY was achieved at the fourth lactation. The highest values of TS, F, P, C and L were found at the fourth lactation in all ewes and at the second lactation in the chosen group of ewes (n = 48). LIS had significant effect on all analyzed basic components except L in all ewes. In the Ewes giving birth to 2 lambs had higher DMY and the higher values of all basic components, SCC, the longest RCT and worse RCQ in comparison with ewes giving birth to 1 lamb. A had significant effect on all analyzed basic components and on pH and TA. The ewes in age 4 years had the highest DMY. The highest values of TS, F, P and C were found in age 6 years.
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